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<?php |
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namespace Yiisoft\EventDispatcher\Provider; |
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use Psr\EventDispatcher\ListenerProviderInterface; |
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use function array_values; |
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use function class_implements; |
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use function class_parents; |
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use function get_class; |
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/** |
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* ConcreteProvider is a listener provider that registers event listeners for interface names specified explicitly |
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* and gives out a list of handlers for further use with Dispatcher. |
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* |
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* ```php |
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* $provider = new Yiisoft\EventDispatcher\Provider\ConcreteProvider(); |
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* $provider->attach(SomeEvent::class, function () { |
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* // handle it |
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* }); |
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* ``` |
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*/ |
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final class ConcreteProvider implements ListenerProviderInterface |
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{ |
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/** |
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* @var callable[] |
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*/ |
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private array $listeners = []; |
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/** |
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* @param object $event |
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* @return iterable<callable> |
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*/ |
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public function getListenersForEvent(object $event): iterable |
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{ |
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yield from $this->listenersFor(get_class($event)); |
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yield from $this->listenersFor(...array_values(class_parents($event))); |
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yield from $this->listenersFor(...array_values(class_implements($event))); |
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} |
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/** |
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* Attach an event handler for the given event name |
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* |
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* @param string $eventName |
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* @param callable $listener |
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*/ |
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public function attach(string $eventName, callable $listener): void |
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{ |
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$this->listeners[$eventName][] = $listener; |
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} |
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/** |
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* Detach all event handlers registered for an interface |
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* |
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* @param string $eventName |
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*/ |
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public function detach(string $eventName): void |
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{ |
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unset($this->listeners[$eventName]); |
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} |
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/** |
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* @param string ...$eventNames |
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* @return iterable<callable> |
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*/ |
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private function listenersFor(string ...$eventNames): iterable |
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{ |
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foreach ($eventNames as $name) { |
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if (isset($this->listeners[$name])) { |
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yield from $this->listeners[$name]; |
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} |
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} |
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} |
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} |
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yiisoft /
event-dispatcher
